#include <REGX52.H>
#include "Delay.h"
/**
  * @brief  矩阵键盘读取按键键码
  * @param  无
  * @retval KeyNumber 按下按键的键码值
	如果按键按下不放，程序会停留在此函数，松手的一瞬间返回按键键码，没有则返回0
  */
unsigned char MatrixKey()
{
	unsigned char KeyNumber=0;
	P1=0xff;//高电平
	P1_3=0;//第一列右接低电平
	if (P1_7==0){Delay1ms(20);while(P1_7==0);Delay1ms(20);KeyNumber=1;}
	if (P1_6==0){Delay1ms(20);while(P1_6==0);Delay1ms(20);KeyNumber=5;}
	if (P1_5==0){Delay1ms(20);while(P1_5==0);Delay1ms(20);KeyNumber=9;}
	if (P1_4==0){Delay1ms(20);while(P1_4==0);Delay1ms(20);KeyNumber=13;}
	//第一列
	P1=0xff;//高电平
	P1_2=0;//第二列右接低电平
	if (P1_7==0){Delay1ms(20);while(P1_7==0);Delay1ms(20);KeyNumber=2;}
	if (P1_6==0){Delay1ms(20);while(P1_6==0);Delay1ms(20);KeyNumber=6;}
	if (P1_5==0){Delay1ms(20);while(P1_5==0);Delay1ms(20);KeyNumber=10;}
	if (P1_4==0){Delay1ms(20);while(P1_4==0);Delay1ms(20);KeyNumber=14;}
	
	P1=0xff;//高电平
	P1_1=0;//第三列右接低电平
	if (P1_7==0){Delay1ms(20);while(P1_7==0);Delay1ms(20);KeyNumber=3;}
	if (P1_6==0){Delay1ms(20);while(P1_6==0);Delay1ms(20);KeyNumber=7;}
	if (P1_5==0){Delay1ms(20);while(P1_5==0);Delay1ms(20);KeyNumber=11;}
	if (P1_4==0){Delay1ms(20);while(P1_4==0);Delay1ms(20);KeyNumber=15;}
	
	P1=0xff;//高电平
	P1_0=0;//第四列右接低电平
	if (P1_7==0){Delay1ms(20);while(P1_7==0);Delay1ms(20);KeyNumber=4;}
	if (P1_6==0){Delay1ms(20);while(P1_6==0);Delay1ms(20);KeyNumber=8;}
	if (P1_5==0){Delay1ms(20);while(P1_5==0);Delay1ms(20);KeyNumber=12;}
	if (P1_4==0){Delay1ms(20);while(P1_4==0);Delay1ms(20);KeyNumber=16;}
		
	
	

	return KeyNumber;
}